diff -Naur ceph-10.2.10.orig/src/global/signal_handler.h ceph-10.2.10/src/global/signal_handler.h
--- ceph-10.2.10.orig/src/global/signal_handler.h	2017-10-04 16:19:25.000000000 +0200
+++ ceph-10.2.10/src/global/signal_handler.h	2021-03-07 21:29:10.000445565 +0100
@@ -22,11 +22,7 @@
 
 typedef void (*signal_handler_t)(int);
 
-#ifndef HAVE_REENTRANT_STRSIGNAL
-# define sig_str(signum) sys_siglist[signum]
-#else
-# define sig_str(signum) strsignal(signum)
-#endif
+#define sig_str(signum) strsignal(signum)
 
 void install_sighandler(int signum, signal_handler_t handler, int flags);